Interactive art installation on Stanford's campus by deena rosen.The vending tree was an art experiment to challenge perceptions of nature, technology and communication in a fun way. How it works: The tree senses you passing by and alerts you with a welcoming sound and flashing lights. When you place a coin in the slot and press a button, a golden egg falls out of the tree and lands at your feet. The egg contains a packet of California poppy seeds, a map of campus, and a poem.